Not always possible. I agree that many players hit a high BH when they should be running around the ball to hit a FH smash. However, for quick, lower trajectory lobs, this might not be practical. This is where the BH smash comes in.
Absolutely. There is a time and place for the BH smash. It is off a certain type of lob. You have done a good job of identifying on which type of lob to try it. I tried to illustrate when not to try it.